diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7fb9b660f..07d78e58e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -13,6 +13,7 @@ jobs:
     - uses: actions/checkout@v2
     - uses: cachix/install-nix-action@v14.1
       with:
+        install_url: https://releases.nixos.org/nix/nix-2.3.16/install
         nix_path: nixpkgs=channel:nixos-21.05
     - uses: cachix/cachix-action@v10
       with: